Boba Milk Tea Cake

Name: Boba Milk Tea Cake
Prep time: 1 h 20 min
Cook time: 25 min
Total time: 1 h 45 min
Cuisine: Chinese
Ingredients: 1/2 cup whole milk; 6 oz butter; 5 eggs; 5 tea bags black tea; 2 tsp baking powder; 2.5 cups (10½ oz) flour; 1 cup (5 oz) icing sugar; 1 pinch salt; 1/2 cup (2½ oz) brown sugar; 100 g black tapioca pearls; 1/2 cup water; 3/4 cup whole milk; 1/2 cup (3 oz) sugar; 3 tbsp milk tea syrup; 10 oz soft butter; 2 packets vanilla sugar; 1 3/4 cup (9 oz) icing sugar